Improvement in springs and spring fabrics



V W.A'. LE Row,

Improvement in Spring and Spring Fabrics.

No. 131,885. Patented Oct.1,1872.

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\ UNITED STATES WILLIAM A. LE ROW, OF BOSTON, MASSACHUSETTS, ASSIGNOR TOHIMSELF" PATENT Ore.

AND E. RFLINT, OF SAME PLACE.

IMPROVEMENT IN SP RINGS AND SPRING FABRICS.

Specification forming part of Letters Patent No. 131,885, dated October1, 1872. a

To all whom it may concern:

Be it known that 1, WILLIAM A. LE Row,

' of Boston, in the county of Suffolk and State of Massachusetts, haveinvented an Improved Spring and Spring Fabric; andI do hereby declarethat the following, taken in connection with the drawing whichaccompanies and forms part of this specification, is a description of myinvention sufficient to enable those skilled in the art to practice it.

My invention relates to the construction of a spring and spring fabric,to be particularly employed for a bed-bottom, or for analogous purposes.p

In my invention I make a spring by taking a strip of thin metal,preferably steel, and forming in the strip corrugations running in thedirection of the length of the strip; and I then form from thiscorrugated strip a coiled spiral spring, which spring possesses greatflexibility and. also great strength, the spring having a great degreeof elasticity, both in the direction of its length and radially.

The invention consists, primarily, in this construction of a spring, andfor a bed-bottom or I similar use, I combine springs of this kind byinterlocking the coils, the fabric thus produced, and which constitutespart of my invention, being strong, elastic, proof against injury fromtorsional strain, and peculiarly adapted for stretching for bed-bottoms.

The drawing represents at A and B, respectively, a plan of a singlespring embodying my invention, and a plan of aseries of such springscombined to form the fabric.

0 denotes the strip of metal, made withcorrugations b, and spirallywound to form the coils c. d e f show a series of the spiral springsinterlocked, as seen at 9, thereby forming the fabric or sheet spring.The springs in the fabric may vary in size or width of strip, and instrength and degree of elasticity, in accordance with the respectiveposition each is to occupy in the fabric with relation to the Weight tobe supported upon the fabric, and the springs may be closely coiled orformed with closely-wound spirals, and be used as cords or connectingdevices as well as for springs. By attaching the fabric to a suitableframe, a

